Know all about Chert and Pseudotachylite properties here. All properties of rocks are important as they define the type of rock and its application. Chert belongs to Sedimentary Rocks while Pseudotachylite belongs to Metamorphic Rocks.Texture of Chert is Banded, Rough whereas that of Pseudotachylite is Quench. Chert appears Glassy or Pearly and Pseudotachylite appears Dull and Soft. The luster of Chert is waxy and dull while that of Pseudotachylite is vitreous. Chert is available in black, brown, green, grey, red, white colors whereas Pseudotachylite is available in black, brown, colourless, green, grey, pink, white colors. The commercial uses of Chert and Pseudotachylite are creating artwork, gemstone, in fire-starting tools, jewelry, to ignite fire, used in flintlock firearms.